cmdPhaseComplete now updates REQUIREMENTS.md when a phase finishes: - Checks off requirement checkboxes (- [ ] → - [x]) - Updates traceability table status (Pending → Complete) Parses Requirements line from ROADMAP.md phase section to find which REQ-IDs belong to the completing phase. Fixes #539 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>